COBOL Manual for TNS/E Programs (H06.08+, J06.03+)

Decimal Numeric Literal
Maximum number of digits in one decimal numeric literal: 18.
Hexadecimal Numeric Literal
Maximum number of hexadecimal digits: 16 (8 pairs).
Simple Nonnumeric Literal
Maximum number of characters: 160.
Hexadecimal Nonnumeric Literal
Maximum number of hexadecimal digits: 320 (160 pairs).
National Literal
Maximum number of characters: 160.
1008 Language Elements and Expressions